Encountering an npm build error in a Vue Docker environment: “Invalid custom keyword definition: flag must be boolean.” Check the revised error log and Dockerfile below:
# Build log snippet
Building production...
ERROR: Keyword misconfiguration: flag must be boolean.
# Revised Dockerfile
FROM node:12-alpine as builder
WORKDIR /src/app
COPY client/package.json .
RUN npm install
COPY client .
RUN npm run compile
hey, try updtaeing your node version. older versions may not process the custom flag correctly. check your config for any mismatched types. maybe also see if any vue plugin is causing issues.
I ran into a similar error while working on a Vue project in a Docker environment, and I discovered that the issue was related to outdated dependencies conflicting with newer validation formats. In my case, updating specific packages that rely on JSON schema validation, especially those handling custom keywords, resolved the error. I also checked my Dockerfile to confirm that the node version was compatible. It was a process of elimination, gradually isolating the problematic configuration until the build could proceed without triggering the custom keyword error.
Encountering a similar error previously, I found that the underlying cause was a subtle incompatibility between the tooling for JSON schema validation and the custom configuration in some dependencies. I overcame the obstacle by scrutinizing the version histories of packages involved in schema handling. Specifically, updating the package responsible for JSON schema validation resolved the issue while ensuring that any custom options remained booleans. I also double-checked the project configuration to verify that no conflicting settings were present. This approach enabled a smooth build process.